/* ==========================================================================
   THE YEARBOOK CMS STUDIO — Admin Stylesheet (`admin.css`)
   ========================================================================== */

:root {
  --admin-bg: #f8f8f7;
  --admin-sidebar-bg: #121212;
  --admin-sidebar-text: #ffffff;
  --admin-sidebar-muted: #888888;
  --admin-card-bg: #ffffff;
  --admin-border: #e6e6e4;
  --admin-border-dark: #2a2a2a;
  --admin-text: #1a1a1a;
  --admin-text-muted: #666664;
  --admin-primary: #121212;
  --admin-accent: #7c3aed;
  --admin-danger: #ef4444;
  --admin-success: #10b981;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, ui-monospace, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--admin-text);
  background-color: var(--admin-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--admin-text);
  border: 1px solid var(--admin-border);
  border-radius: 0.35rem;
  padding: 0.5rem 0.75rem;
  background-color: #fff;
  outline: none;
  width: 100%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--admin-primary);
  box-shadow: 0 0 0 2px rgba(0,0,0,0.06);
}

textarea {
  resize: vertical;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Layout */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.admin-sidebar {
  width: 260px;
  background-color: var(--admin-sidebar-bg);
  color: var(--admin-sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.admin-sidebar__brand {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--admin-border-dark);
}

.admin-brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.admin-brand-icon {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.admin-brand-text {
  display: flex;
  flex-direction: column;
}

.admin-brand-text strong {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.admin-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--admin-sidebar-muted);
  text-transform: uppercase;
}

.admin-nav {
  padding: 1.25rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  overflow-y: auto;
}

.admin-nav__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  color: var(--admin-sidebar-muted);
  border-radius: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: left;
}

.admin-nav__item:hover {
  color: var(--admin-sidebar-text);
  background-color: rgba(255,255,255,0.06);
}

.admin-nav__item.is-active {
  color: var(--admin-sidebar-text);
  background-color: rgba(255,255,255,0.12);
  font-weight: 600;
}

.admin-nav__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  border-radius: 9999px;
  background-color: rgba(255,255,255,0.1);
  color: #fff;
}

.admin-sidebar__footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--admin-border-dark);
}

.btn-sidebar-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--admin-sidebar-muted);
  transition: color 0.2s;
}

.btn-sidebar-link:hover {
  color: var(--admin-sidebar-text);
}

/* Main Content Area */
.admin-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Topbar */
.admin-topbar {
  height: 64px;
  background-color: #fff;
  border-bottom: 1px solid var(--admin-border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.admin-topbar__left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-mobile-menu {
  display: none;
}

.admin-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.admin-breadcrumb__root {
  color: var(--admin-text-muted);
}

.admin-breadcrumb__sep {
  color: #ccc;
}

.admin-breadcrumb__curr {
  font-weight: 600;
}

.admin-topbar__right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Sync Status Pill */
.admin-sync-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.admin-sync-pill.is-dirty {
  background: rgba(245, 158, 11, 0.14);
  color: #d97706;
  border-color: rgba(245, 158, 11, 0.35);
}

.admin-history-group {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding-right: 0.5rem;
  border-right: 1px solid var(--admin-border);
}

.btn--icon {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.45rem 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: 0.35rem;
  transition: all 0.2s ease;
}

.btn--primary {
  background-color: var(--admin-primary);
  color: #fff;
}

.btn--primary:hover {
  background-color: #2b2b2b;
}

.btn--accent {
  background-color: var(--admin-accent);
  color: #fff;
}

.btn--accent:hover {
  background-color: #6d28d9;
}

.btn--subtle {
  background-color: #fff;
  border: 1px solid var(--admin-border);
  color: var(--admin-text);
}

.btn--subtle:hover {
  border-color: #999;
}

.btn--danger {
  background-color: var(--admin-danger);
  color: #fff;
}

.btn--danger:hover {
  background-color: #dc2626;
}

.btn-text-link {
  color: var(--admin-accent);
  text-decoration: underline;
  cursor: pointer;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.3rem;
  color: var(--admin-text-muted);
}

.btn-icon:hover {
  background-color: #f0f0ee;
  color: var(--admin-text);
}

/* Content Area */
.admin-content {
  padding: 2rem;
  max-width: 1200px;
  width: 100%;
}

.admin-panel {
  display: none;
}

.admin-panel.is-active {
  display: block;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}

.panel-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.panel-subtitle {
  font-size: 0.875rem;
  color: var(--admin-text-muted);
  margin-top: 0.25rem;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  min-width: 280px;
  flex: 1;
  max-width: 400px;
}

.search-box svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: #999;
}

.search-box input {
  padding-left: 2.25rem;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.filter-group select {
  width: auto;
  min-width: 140px;
}

/* Article Cards Editor List */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.article-edit-card {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  display: flex;
  gap: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}

.article-edit-card__cover {
  width: 120px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-edit-card__thumb {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border-radius: 0.3rem;
  background-color: #eee;
}

.article-edit-card__fields {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.fields-row {
  display: flex;
  gap: 1rem;
}

.fields-row--3 {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 0.75rem;
}

.fields-row--meta {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 0.75rem;
}

.article-edit-card__actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* Track List */
.track-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.track-edit-card {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.track-edit-card__thumb {
  width: 48px;
  height: 48px;
  border-radius: 0.25rem;
  object-fit: cover;
  flex-shrink: 0;
  background-color: #eee;
  cursor: pointer;
}

.track-edit-card__fields {
  flex: 1;
  display: grid;
  grid-template-columns: 1.5fr 1.5fr 3fr;
  gap: 0.75rem;
}

.track-edit-card__actions {
  display: flex;
  gap: 0.25rem;
}

/* Forms */
.admin-form {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--admin-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.form-subheading {
  font-size: 1rem;
  font-weight: 700;
  border-bottom: 1px solid var(--admin-border);
  padding-bottom: 0.5rem;
  margin-top: 1rem;
}

.input-with-button {
  display: flex;
  gap: 0.5rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #ccc;
  transition: 0.3s;
  border-radius: 22px;
}

.toggle-slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--admin-success);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(18px);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--admin-border);
  border-radius: 0.5rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  background-color: #fafaf9;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.upload-zone:hover,
.upload-zone.is-dragover {
  border-color: var(--admin-accent);
  background-color: #f5f3ff;
}

.upload-zone svg {
  color: #888;
}

.upload-hint {
  font-size: 0.75rem;
  color: var(--admin-text-muted);
}

/* Media Library Grid */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.media-item {
  background-color: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 0.35rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.media-item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background-color: #eee;
}

.media-item__caption {
  padding: 0.4rem 0.5rem;
  font-size: 0.7rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--admin-text-muted);
}

/* Backups */
.backup-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.backup-card {
  background-color: var(--admin-card-bg);
  border: 1px solid var(--admin-border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.backup-card h4 {
  font-size: 1rem;
  font-weight: 600;
}

.backup-card p {
  font-size: 0.8rem;
  color: var(--admin-text-muted);
  line-height: 1.4;
  flex: 1;
}

.backup-card--danger {
  border-color: #fecaca;
  background-color: #fff5f5;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  opacity: 0;
  transition: visibility 0.25s, opacity 0.25s;
}

.modal.is-open {
  visibility: visible;
  opacity: 1;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
}

.modal__panel {
  position: relative;
  background-color: #fff;
  border-radius: 0.5rem;
  width: 600px;
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  z-index: 2;
}

.modal__header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--admin-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal__title {
  font-size: 1.05rem;
  font-weight: 600;
}

.modal__body {
  padding: 1.25rem;
  overflow-y: auto;
}

.modal-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--admin-border);
  padding-bottom: 0.75rem;
}

.modal-tab {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 0.3rem;
  color: var(--admin-text-muted);
}

.modal-tab.is-active {
  background-color: var(--admin-primary);
  color: #fff;
}

.picker-view {
  display: none;
  margin-top: 1rem;
}

.picker-view.is-active {
  display: block;
}

.picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.75rem;
  max-height: 320px;
  overflow-y: auto;
}

.picker-thumb {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.3rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
}

.picker-thumb:hover {
  transform: scale(1.05);
  border-color: var(--admin-accent);
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background-color: #121212;
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0.4rem;
  font-size: 0.85rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  pointer-events: auto;
  animation: slideInToast 0.3s cubic-bezier(0.16,1,0.3,1);
}

.toast--success {
  border-left: 4px solid var(--admin-success);
}

.toast--error {
  border-left: 4px solid var(--admin-danger);
}

@keyframes slideInToast {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Mobile Responsive */
@media (max-width: 900px) {
  .admin-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
  }
  .admin-sidebar.is-open {
    transform: translateX(0);
    box-shadow: 10px 0 30px rgba(0,0,0,0.5);
  }
  .btn-mobile-menu {
    display: inline-flex;
  }
  .admin-topbar {
    padding: 0 1rem;
  }
  .admin-content {
    padding: 1.25rem;
  }
  .article-edit-card {
    flex-direction: column;
  }
  .article-edit-card__cover {
    width: 100%;
    max-width: 160px;
  }
  .fields-row--3,
  .fields-row--meta,
  .track-edit-card__fields {
    grid-template-columns: 1fr;
  }
  .track-edit-card {
    flex-wrap: wrap;
  }
}